fs/xfs/xfs_ialloc_btree.h

   1 /*
   2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_IALLOC_BTREE_H__
  33 #define __XFS_IALLOC_BTREE_H__
  34
  35 /*
  36  * Inode map on-disk structures
  37  */
  38
  39 struct xfs_buf;
  40 struct xfs_btree_cur;
  41 struct xfs_btree_sblock;
  42 struct xfs_mount;
  43
  44 /*
  45  * There is a btree for the inode map per allocation group.
  46  */
  47 #define XFS_IBT_MAGIC   0x49414254      /* 'IABT' */
  48
  49 typedef __uint64_t      xfs_inofree_t;
  50 #define XFS_INODES_PER_CHUNK    (NBBY * sizeof(xfs_inofree_t))
  51 #define XFS_INODES_PER_CHUNK_LOG        (XFS_NBBYLOG + 3)
  52 #define XFS_INOBT_ALL_FREE      ((xfs_inofree_t)-1)
  53
  54 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_MASKN)
  55 xfs_inofree_t xfs_inobt_maskn(int i, int n);
  56 #define XFS_INOBT_MASKN(i,n)            xfs_inobt_maskn(i,n)
  57 #else
  58 #define XFS_INOBT_MASKN(i,n)    \
  59         ((((n) >= XFS_INODES_PER_CHUNK ? \
  60                 (xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i))
  61 #endif
  62
  63 /*
  64  * Data record structure
  65  */
  66 typedef struct xfs_inobt_rec
  67 {
  68         xfs_agino_t     ir_startino;    /* starting inode number */
  69         __int32_t       ir_freecount;   /* count of free inodes (set bits) */
  70         xfs_inofree_t   ir_free;        /* free inode mask */
  71 } xfs_inobt_rec_t;
  72
  73 /*
  74  * Key structure
  75  */
  76 typedef struct xfs_inobt_key
  77 {
  78         xfs_agino_t     ir_startino;    /* starting inode number */
  79 } xfs_inobt_key_t;
  80
  81 typedef xfs_agblock_t xfs_inobt_ptr_t;  /* btree pointer type */
  82                                         /* btree block header type */
  83 typedef struct xfs_btree_sblock xfs_inobt_block_t;
  84
  85 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_INOBT_BLOCK)
  86 xfs_inobt_block_t *xfs_buf_to_inobt_block(struct xfs_buf *bp);
  87 #define XFS_BUF_TO_INOBT_BLOCK(bp)      xfs_buf_to_inobt_block(bp)
  88 #else
  89 #define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)(XFS_BUF_PTR(bp)))
  90 #endif
  91
  92 /*
  93  * Bit manipulations for ir_free.
  94  */
  95 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_MASK)
  96 xfs_inofree_t xfs_inobt_mask(int i);
  97 #define XFS_INOBT_MASK(i)               xfs_inobt_mask(i)
  98 #else
  99 #define XFS_INOBT_MASK(i)               ((xfs_inofree_t)1 << (i))
 100 #endif
 101 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_IS_FREE)
 102 int xfs_inobt_is_free(xfs_inobt_rec_t *rp, int i, xfs_arch_t arch);
 103 #define XFS_INOBT_IS_FREE(rp,i,arch)    xfs_inobt_is_free(rp,i,arch)
 104 #else
 105 #define XFS_INOBT_IS_FREE(rp,i,arch)    ((INT_GET((rp)->ir_free, arch) \
 106                                          & XFS_INOBT_MASK(i)) != 0)
 107 #endif
 108 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_SET_FREE)
 109 void xfs_inobt_set_free(xfs_inobt_rec_t *rp, int i, xfs_arch_t arch);
 110 #define XFS_INOBT_SET_FREE(rp,i,arch)   xfs_inobt_set_free(rp,i,arch)
 111 #else
 112 #define XFS_INOBT_SET_FREE(rp,i,arch)   (INT_MOD_EXPR((rp)->ir_free, arch, |= XFS_INOBT_MASK(i)))
 113 #endif
 114 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_CLR_FREE)
 115 void xfs_inobt_clr_free(xfs_inobt_rec_t *rp, int i, xfs_arch_t arch);
 116 #define XFS_INOBT_CLR_FREE(rp,i,arch)   xfs_inobt_clr_free(rp,i,arch)
 117 #else
 118 #define XFS_INOBT_CLR_FREE(rp,i,arch)   (INT_MOD_EXPR((rp)->ir_free, arch, &= ~XFS_INOBT_MASK(i)))
 119 #endif
 120
 121 /*
 122  * Real block structures have a size equal to the disk block size.
 123  */
 124 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_BLOCK_SIZE)
 125 int xfs_inobt_block_size(int lev, struct xfs_btree_cur *cur);
 126 #define XFS_INOBT_BLOCK_SIZE(lev,cur)   xfs_inobt_block_size(lev,cur)
 127 #else
 128 #define XFS_INOBT_BLOCK_SIZE(lev,cur)   (1 << (cur)->bc_blocklog)
 129 #endif
 130
 131 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_BLOCK_MAXRECS)
 132 int xfs_inobt_block_maxrecs(int lev, struct xfs_btree_cur *cur);
 133 #define XFS_INOBT_BLOCK_MAXRECS(lev,cur)        xfs_inobt_block_maxrecs(lev,cur)
 134 #else
 135 #define XFS_INOBT_BLOCK_MAXRECS(lev,cur)        \
 136         ((cur)->bc_mp->m_inobt_mxr[lev != 0])
 137 #endif
 138 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_BLOCK_MINRECS)
 139 int xfs_inobt_block_minrecs(int lev, struct xfs_btree_cur *cur);
 140 #define XFS_INOBT_BLOCK_MINRECS(lev,cur)        xfs_inobt_block_minrecs(lev,cur)
 141 #else
 142 #define XFS_INOBT_BLOCK_MINRECS(lev,cur)        \
 143         ((cur)->bc_mp->m_inobt_mnr[lev != 0])
 144 #endif
 145
 146 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_IS_LAST_REC)
 147 int xfs_inobt_is_last_rec(struct xfs_btree_cur *cur);
 148 #define XFS_INOBT_IS_LAST_REC(cur)      xfs_inobt_is_last_rec(cur)
 149 #else
 150 #define XFS_INOBT_IS_LAST_REC(cur)      \
 151         ((cur)->bc_ptrs[0] == \
 152                 INT_GET(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs, ARCH_CONVERT))
 153 #endif
 154
 155 /*
 156  * Maximum number of inode btree levels.
 157  */
 158 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IN_MAXLEVELS)
 159 int xfs_in_maxlevels(struct xfs_mount *mp);
 160 #define XFS_IN_MAXLEVELS(mp)            xfs_in_maxlevels(mp)
 161 #else
 162 #define XFS_IN_MAXLEVELS(mp)            ((mp)->m_in_maxlevels)
 163 #endif
 164
 165 /*
 166  * block numbers in the AG.
 167  */
 168 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IBT_BLOCK)
 169 xfs_agblock_t xfs_ibt_block(struct xfs_mount *mp);
 170 #define XFS_IBT_BLOCK(mp)               xfs_ibt_block(mp)
 171 #else
 172 #define XFS_IBT_BLOCK(mp)       ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
 173 #endif
 174 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_PREALLOC_BLOCKS)
 175 xfs_agblock_t xfs_prealloc_blocks(struct xfs_mount *mp);
 176 #define XFS_PREALLOC_BLOCKS(mp)         xfs_prealloc_blocks(mp)
 177 #else
 178 #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
 179 #endif
 180
 181 /*
 182  * Record, key, and pointer address macros for btree blocks.
 183  */
 184 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_REC_ADDR)
 185 xfs_inobt_rec_t *
 186 xfs_inobt_rec_addr(xfs_inobt_block_t *bb, int i, struct xfs_btree_cur *cur);
 187 #define XFS_INOBT_REC_ADDR(bb,i,cur)    xfs_inobt_rec_addr(bb,i,cur)
 188 #else
 189 #define XFS_INOBT_REC_ADDR(bb,i,cur)    \
 190         XFS_BTREE_REC_ADDR(XFS_INOBT_BLOCK_SIZE(0,cur), xfs_inobt, bb, i, \
 191                 XFS_INOBT_BLOCK_MAXRECS(0, cur))
 192 #endif
 193
 194 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_KEY_ADDR)
 195 xfs_inobt_key_t *
 196 xfs_inobt_key_addr(xfs_inobt_block_t *bb, int i, struct xfs_btree_cur *cur);
 197 #define XFS_INOBT_KEY_ADDR(bb,i,cur)    xfs_inobt_key_addr(bb,i,cur)
 198 #else
 199 #define XFS_INOBT_KEY_ADDR(bb,i,cur)    \
 200         XFS_BTREE_KEY_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, i, \
 201                 XFS_INOBT_BLOCK_MAXRECS(1, cur))
 202 #endif
 203
 204 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_PTR_ADDR)
 205 xfs_inobt_ptr_t *
 206 xfs_inobt_ptr_addr(xfs_inobt_block_t *bb, int i, struct xfs_btree_cur *cur);
 207 #define XFS_INOBT_PTR_ADDR(bb,i,cur)    xfs_inobt_ptr_addr(bb,i,cur)
 208 #else
 209 #define XFS_INOBT_PTR_ADDR(bb,i,cur)    \
 210         XFS_BTREE_PTR_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, i, \
 211                 XFS_INOBT_BLOCK_MAXRECS(1, cur))
 212 #endif
 213
 214 /*
 215  * Prototypes for externally visible routines.
 216  */
 217
 218 /*
 219  * Decrement cursor by one record at the level.
 220  * For nonzero levels the leaf-ward information is untouched.
 221  */
 222 int                                     /* error */
 223 xfs_inobt_decrement(
 224         struct xfs_btree_cur    *cur,   /* btree cursor */
 225         int                     level,  /* level in btree, 0 is leaf */
 226         int                     *stat); /* success/failure */
 227
 228 /*
 229  * Delete the record pointed to by cur.
 230  * The cursor refers to the place where the record was (could be inserted)
 231  * when the operation returns.
 232  */
 233 int                                     /* error */
 234 xfs_inobt_delete(
 235         struct xfs_btree_cur    *cur,   /* btree cursor */
 236         int                     *stat); /* success/failure */
 237
 238 /*
 239  * Get the data from the pointed-to record.
 240  */
 241 int                                     /* error */
 242 xfs_inobt_get_rec(
 243         struct xfs_btree_cur    *cur,   /* btree cursor */
 244         xfs_agino_t             *ino,   /* output: starting inode of chunk */
 245         __int32_t               *fcnt,  /* output: number of free inodes */
 246         xfs_inofree_t           *free,  /* output: free inode mask */
 247         int                     *stat,  /* output: success/failure */
 248         xfs_arch_t              arch);  /* output: architecture */
 249
 250 /*
 251  * Increment cursor by one record at the level.
 252  * For nonzero levels the leaf-ward information is untouched.
 253  */
 254 int                                     /* error */
 255 xfs_inobt_increment(
 256         struct xfs_btree_cur    *cur,   /* btree cursor */
 257         int                     level,  /* level in btree, 0 is leaf */
 258         int                     *stat); /* success/failure */
 259
 260 /*
 261  * Insert the current record at the point referenced by cur.
 262  * The cursor may be inconsistent on return if splits have been done.
 263  */
 264 int                                     /* error */
 265 xfs_inobt_insert(
 266         struct xfs_btree_cur    *cur,   /* btree cursor */
 267         int                     *stat); /* success/failure */
 268
 269 /*
 270  * Lookup the record equal to ino in the btree given by cur.
 271  */
 272 int                                     /* error */
 273 xfs_inobt_lookup_eq(
 274         struct xfs_btree_cur    *cur,   /* btree cursor */
 275         xfs_agino_t             ino,    /* starting inode of chunk */
 276         __int32_t               fcnt,   /* free inode count */
 277         xfs_inofree_t           free,   /* free inode mask */
 278         int                     *stat); /* success/failure */
 279
 280 /*
 281  * Lookup the first record greater than or equal to ino
 282  * in the btree given by cur.
 283  */
 284 int                                     /* error */
 285 xfs_inobt_lookup_ge(
 286         struct xfs_btree_cur    *cur,   /* btree cursor */
 287         xfs_agino_t             ino,    /* starting inode of chunk */
 288         __int32_t               fcnt,   /* free inode count */
 289         xfs_inofree_t           free,   /* free inode mask */
 290         int                     *stat); /* success/failure */
 291
 292 /*
 293  * Lookup the first record less than or equal to ino
 294  * in the btree given by cur.
 295  */
 296 int                                     /* error */
 297 xfs_inobt_lookup_le(
 298         struct xfs_btree_cur    *cur,   /* btree cursor */
 299         xfs_agino_t             ino,    /* starting inode of chunk */
 300         __int32_t               fcnt,   /* free inode count */
 301         xfs_inofree_t           free,   /* free inode mask */
 302         int                     *stat); /* success/failure */
 303
 304 /*
 305  * Update the record referred to by cur, to the value given
 306  * by [ino, fcnt, free].
 307  * This either works (return 0) or gets an EFSCORRUPTED error.
 308  */
 309 int                                     /* error */
 310 xfs_inobt_update(
 311         struct xfs_btree_cur    *cur,   /* btree cursor */
 312         xfs_agino_t             ino,    /* starting inode of chunk */
 313         __int32_t               fcnt,   /* free inode count */
 314         xfs_inofree_t           free);  /* free inode mask */
 315
 316 #endif  /* __XFS_IALLOC_BTREE_H__ */